I can comment on 2 as a swiss developer: It depends. While it might not be the prevalent spoken language, all small companies and startups i worked at so far ha

I can comment on 2 as a swiss developer: It depends. While it might not be the prevalent spoken language, all small companies and startups i worked at so far had code comments, commit messages and issue tracker stories in english. The larger, more estabilished companies had most text in german. But everybody is willing to switch to spoken english in my experience.